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Jadambaa Temuujin 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.2
Influence of Cerium oxide (CeO2) addition in crystallization behavior and mechanical properties of glass ceramics in the Na2OCaO-Al2O3-SiO2system have been studied. Thermal behavior and hardness were studied by DTA-TG and indentationtechniques respectively. Glass ceramic precursors were prepared by fusing fly ash, window glass and fluorite either with(0.5 wt.%) or without cerium oxide at 1500 oC for 4 hrs followed by quenching in cold water. Crystallization of the amorphousprecursor occurred after 30 min at 800 oC forming plagioclase-type minerals. Hardness of the glass ceramics sintered at1000 oC was 5.66 GPa, while in the sample with cerium oxide was 7.45 GPa.
Ulambayar Rentsennorov,Batmunkh Davaabal,Bayaraa Dovchin,JadambaaTemuujin 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.2
In this work, the potential application of using zeolite A synthesized from fly ash to remove Cr (III) from aqueous solutionswas studied. Zeolite A was synthesized from acid-washed fly ash by alkali fusion followed by hydrothermal treatment. The acidwashing removed Ca and Fe from the fly ash, which allowed synthesis of the required zeolite. The acid-washed fly ash andNaOH were mixed at a mass ratio of 1:1.2 and heated at various temperatures. The hydrothermal zeolite synthesis was carriedout at 600 oC temperature and the product characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy(SEM). The zeolite achieved maximum adsorption capacity of Cr (III) attaining equilibrium within 30 min at pH 4.0. Theadsorption isotherm for Cr (III) on this zeolite A was tested and showed that the adsorption data of Cr (III) were fitted bestby a Langmuir isotherm.